Pump.



T. A. DE VILBISS.

PUMP.

APPLICATION FILED no. a, 1912.

1,070,429,, Patented Aug. 19, 1913.

Fig 1''; 51

11.11111 illlllilllllll 1 WJTN EEEE' UNITED PATENT @FFTCE.

THOMAS A. DE V-ILBISS, OF TOLEDO, OHIO.

PUMP.

Application filed December 6, 1912.

To all whom it may concern:

Be it known that I, THotn s A. DE VILBISS, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Pump; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to atomizers, and particularly to those of the piston and cylinder air compressing type, but is not restricted to such use as it may be used in any connection for which it may be adapted or appropriate.

The object of my invention is the provision in an instrument of this character, of means for bracing the piston and pistonrod against lateral twisting movements when being operated and preventing a consequent binding action of the piston-rod in its bearing without limiting the maximum length of stroke of the piston within its cylinder, thus enhancing the practicability and efficiency of apparatus of this class.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,

Figures 1 and 2 are different elevations of an instrument embodying the invention, with the pump cylinder and a portion of the piston-rod in the latter in section. Fig. 3 is an outer end view of the guide member for the plunger. Fig. 4i is a central vertical section of the instrument with the nozzle in operative position, and Fig. 5 is an elevation of the instrument with a portion thereof in central vertical section.

Referring to the drawings, 1 designates a liquid receptacle of any suitable form, the top of which is closed by a removable cap 2 by which the spraying parts of the instru ment are carried. In the present instance,

Specification of Letters Patent.

Patented Aug. 19,1913.

Serial No. 735,284.

the cap 2 is shown as being provided with a bearing 3 having a conical opening therethrough into the interior of the receptacle, in which opening the complemental inner end portion of a nozzle 4 is mounted for revoluble movements relative to the cap. The nozzle t is of the customary double tube type, the outer tube forming the air discharge passage and the inner tube forming the liquid discharge tube and being designated 5. The tube 5 has an extension 6 projecting down into the interior of the receptacle to near the bottom thereof. The outer ends of the nozzle tubes terminate in a spray head 7 of any suitable construction. The valve end of the nozzle is held closely seated in the bearing 3 by threading a nut 8 onto the stem 9 projected from the inner end of the nozzle within the receptacle, and interposing a coiled compression spring 10 between said nut and the inner end of the bearing 3, as shown.

The extension 6 of the nozzle liquid tube projects down from one side of the bearing 3 and has communication with the inner end of the nozzle tube 5 through passages 11 and 12 in said bearing and the inner or plug end portion 4 of the nozzle, respectively, when the nozzle is in operative position and such passages are in register, as shown in Fig. 5 and by the operative position of the nozzle relative to the receptacle in Figs. 1 and 4:. It is evident with this construction that a turning of the valve member a of the nozzle from operative position relative to the bearing part 3, will move the passage 12 out .of register with the passage 11, thus completely closing communication between the interior of the receptacle and the liquid discharge tube 5.

Mounted on the cap 2 at one side of the nozzle 4 with its axis disposed in a horizontal plane or transversely of the turning axis of the nozzle, is a pump cylinder 13 in which a plunger 14 works. The plunger 14 has a stem 15 projecting therefrom through a bearing in one end of the cylinder and is provided at its outer end with a head or thumb-piece 16. The plunger is influenced to normally move toward the end of the cylinder from which its stem projects and has its pumping stroke actuated by the pressure on the stem cap 16 of the thumb of a hand grasping the receptacle.

The plunger stem is provided adjacent to its outer end with radially projecting lugs 17 which are adapted to work through registering notches in the cylinder end and then to be turned within the cylinder from register with such notches to coact with the cylinder. end to retain the plunger and stem at the limits of their in or pumping strokes to enable the instrument to be packed in a small space.

Considerable objection has arisen to the use of this type of atomizer-s due to the tendency of the stem 15 to bind in its cylinder hearing when the plunger is in its normal position, as shown in Fig. 2, and other than a direct axial pressure isexerted on the outer end of the stem to force the plunger inward. To overcome this objection and at the same time to secure a plunger stroke of maximum length a bracing guide-member 18 works closely within the cylinder in advance of the plunger and has a stem 19 projecting axially therefrom and into an alining axial socket 20 in the inner end portion of the plunger stem 15. The member 18 is normally held, spaced from the plunger 14; by a coiled compression spring 21 acting on the end of the stem 19 within the socket 20, While a coiled compression spring 22 is interposed between the guide member 18 and the outer end of the cylinder and serves to normally maintain the plunger 14 at the limit of its outward or suction stroke and the member 18 in its normal position relative to the plunger. The spring 22 is of less tension than the spring 21 so that such member is normally held in its spaced position relative to the plunger 14 against the tension of the spring 22. It is evident with this arrangement that upon a compression stroke of the plunger 14:, the guide member 18 and its stem 19 will brace the plunger and its stem against lateral strains tending to cause a binding of the plunger stem in its cylinder bearing and that the member 18 will move with the plunger and maintain its normal spaced relation thereto until the spring 22 is compressed sufficiently to overcome the tension of the spring 21, when the plunger will move toward the member 18, thus permitting the plunger to have substantially the same length of stroke as it would if the guide member 18 were not used.

The cylinder 13 has its lower outer end portion in connection through a tube with a lateral passage 24- in one side of the bearing 3, which passage, when the nozzle 7 is in its operative position, registers with an angled passage 25 in the valve portion 1 of the nozzle, said angled passage having one end in communication with the air passage 5 within the outer tube of the nozzle.

The passage 25 of the nozzle also has a branch 26 which extends downward and laterally therefrom in position to register at its lower end with a passage 27 in the inner end portion of the bearing 3 to open communication between the upper interior portion of the receptacle 1 and the pump cylinder 13 when the nozzle is in the operative position shown in Fig.4. It is thus apparent that an operation of the pump when the nozzle is in its operative position causes air under pressure to enter the receptacle above the liquid therein to have a compression action thereon, and also causes air to pass through the air tube of the nozzle and past the discharge end of the liquid tube 5 in its discharge from the nozzle head 7 to create a suction action within the liquid tube 5, as is well understood in the art, whereby to cooperate with the compression action of the air within the receptacle to effect a discharge of the liquid in spray form from the nozzl It is preferable to have the discharge end of the nozzle projected laterally from the pump cylinder when the nozzle is in its operative spraying position, as shown in Figs. 1 and 4:, and to have it shaped in such manner as to adapt it to be given a half turn over the pump cylinder, as indicated by the dotted line position in Fig. 1, when turned to inoperative position, thus forming a compact instrument for packing.

I wish it understood that my invention is not limited to any specific construction or arrangement of the parts except in so far as such limitations are specified in the claims.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is,

1. In an instrument of the class described, a fluid pump having a cylinder, a plunger working in said cylinder, a stem projecting from the plunger without an end of the cylinder, and means working within the cylinder and yieldingly spaced from the plunger and having a part coacting with the plunger stem to prevent the same from having other than true axial movements.

2. A fluid pump comprising a cylinder, a plunger within the cylinder having a stem projecting therefrom without an end of the cylinder, a guide member worln'ng in the cylinder and yieldingly spaced from the end thereof opposed to that from which the plunger stem projects, said member having a part projecting therefrom axially into said stem for guiding the movements of the stem, and means yieldingly spacing said plunger and member.

3. A fluid pump comprising a cylinder, a plunger working therein and having a hollow stem projecting without an end of the cylinder, a compression spring in said stem,

THOMAS A. DE VILBISS.

a guide movable in the cylinder in advance of the plunger and having a part projecting therefrom into said stem in end thrust contact With said spring, and means yieldingly spacing said guide and an end of the Witnesses: cylinder and being of less tension than said O. W. OWEN,

S. T. KLOTZ.

spring.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

